Relax wrote:In Enemy Hands wrote:
"Certainly she came up with the concept, but R&D took it and ran with it. We're talking about a 'multistage' missile—one with three separate drives, which will give us a degree of tactical flexibility no previous navy could even dream of! We can preprogram the drives to come on-line with any timing and at any power setting we wish! Simply programming them to activate in immediate succession at maximum power would give us a hundred and eighty seconds of powered flight . . . and a powered attack range from rest of over fourteen and a half million kilometers with a terminal velocity of point-five-four cee. Or we can drop the drives' power settings to forty-six thousand gees and get five times the endurance—and a maximum powered missile envelope of over sixty-five million klicks with a terminal velocity of point-eight-one light-speed. That's a range of three-point-six light-minutes, and we can get even more than that if we use one or two 'stages' to accelerate the weapon, let it ride a ballistic course to a preprogrammed attack range, and then bring up the final 'stage' for terminal attack maneuvers at a full ninety-two thousand gravities.
Book Canon is book canon. Posts on the forum are not.
I believe it is in Storm from the Shadows they are playing with training scenarios using 2 stages @46kG and final at 92kG final stage using apollo.
Technically at that point in In Enemy Hands isn't Honor describing the missiles they hope/expect to build, rather than flight tested hardware results?
The MDMs certainly weren't deployed before she went off on her ill fated convoy escort run.
So there's room to claim that the WDB and BuWeaps
expected to be able to support variable power settings, but real world testing showed that the missiles couldn't actually handle it (yet).
And then I've been through the books before looking for missile acceleration numbers and can't remember finding any example of MDM profile that was anything other than all drives at half power.
I also just looked at the simulation training sequence in Storm from the Shadows and I can't find any acceleration number for the final stage.
Storm from the Shadows wrote:The range-to-target sidebar on the tactical display was preposterous.
The missile salvo was sixty-eight million kilometers from Artemis, speeding steadily onward at 150,029 KPS. Its birds had been ballistic for four and a half minutes, ever since the second drive system had burned out, and they were still ninety-three seconds—almost fourteen million kilometers—from their target
<snip>
The missiles in the attack salvo had been preloaded with dozens of possible attack and EW profiles. Now Adenauer's flying fingers transmitted a series of commands which selected from the menu of preprogrammed options. One command designated the superdreadnoughts as the attack missiles' targets. Another told the Dazzlers and Dragon's Teeth seeded into the salvo when to bring their EW systems up, and in what sequence. A third told the attack missiles when to bring up their final drive stages and what penetration profile to adopt when they hit the enemy force's missile-defense envelope. And a fourth told the Mark 23-Es when and how they should take over and restructure her commands if the enemy suddenly did something outside the parameters of her chosen attack patterns.
Entering those commands took her twenty-five seconds, in which the attack missiles traveled another 3,451,000 kilometers. It took just under four seconds for her commands to reach from Artemis to the Apollos. It took another twelve seconds for her instructions to be receipted, triple-checked, and confirmed by the Apollo AIs while the shrouds on the attack missiles were jettisoned. Forty-five seconds after the first pod's missiles had jettisoned their shrouds, the follow-on salvo opened its eyes, looked ahead, and saw its targets, still two and a quarter million kilometers in front of it.
<snip>
The simulated targets' fire control had only a relatively imprecise idea of where to look for the attack missiles before their third-stage drives came suddenly on-line. They'd still been so far out when they shut down for the ballistic leg of their flight that the defenders' on-board sensors hadn't been able to fully localize them. The target ships had gotten enough to predict their positions to within only a few percentage points of error, but at those velocities, and on such an enormous "battlefield," even tiny uncertainties made precise targeting impossible. And precise targeting was exactly what was necessary for a counter-missile to hit an attack missile at extended range.
The defenders saw the Mark 23s clearly when the attack missiles' final stages came suddenly and abruptly to life, but by then it was already too late. There was no time for any long-range counter-missile launch, and even the short-range CMs had rushed targeting solutions. Worse, the EW platforms supporting the attack came on-line at the worst possible moment for the defenders.
It's certainly true that with a 150,000 kps base velocity you don't need much drive endurance to cover the final 2.5 million km. Actually the drive acceleration is almost irrelevant, just coasting the missile would cover that distance in 16.67 seconds, using half power would cut that to 16.27 seconds, and full power would reducing fractionally more to 15.91 seconds. There's nothing in the text to indicate elapsed time, and even if there was we're not normally given sufficient precision to notice the 1/3rd of a second different between the power settings.
So while that have certainly been cases of RFC making forum posts where he forgot exactly what he'd ended up going with in the books this one seems like there's room to keep missiles less flexible if that's what he wants.
If the missiles were always capable of flexibly choosing different accelerations for each drive then we're confronted with virtually every engagement we've ever seem both sides used sub-optimal acceleration profiles. Setting all 3 drives to low acceleration isn't the best profile until the range is in excess of 70 million km. But MDMs, pre-Apollo, are so inaccurate at that range that combat is almost always initiated at more like 50-60 million km and at
those ranges the best profile would be setting the 1st drive to full power and the 2nd and 3rd to half.
It seems to me we're either confronted with BuWeaps being overoptimistic about the then in development Mk23's final capabilities - OR - every tac officer being too stupid to take advantage of those capabilities. (And to me the former is more palatable)